Abstract: Silica is necessary for rice to grow healthfully.It has been proven by field experiments conducted in different places for seven years that silica shows significant effects on paddy rice to increase disease resistance and grain yield, it increased on average by 21.5% or 45.8kg/mu in mountainous and semi-mountainous areas where rice suffers from rice blast (Pyricularia oryzae Cav.) caused by silica-deficiency. The results also show that silica is one of the foundations for increasing fertilizer (N) application and grain yield. Therefore,silica application has special significance and urgency for rice production in those areas.

Key words: Si fertilizer, Paddy soil, Rice Blast, Disease resistance

摘要： 在山区半山区缺硅多病(稻瘟病)水田进行了施硅肥效果的研究。7年间多点试验结果,施硅使稻瘟病病情指数下降54.6%.平均增产21.5%.亩增稻谷45.8公斤;试验还表明,在这类水田.因受低洼制约,增氮效果难以期望.但以增硅为基础,增氮效果则可正常发挥,所以提高这类水田供硅能力,是实现增肥(N)增产的基础。据此认为,施用硅肥是提高山区半山区多病水田生产力的一项基本措施。

关键词: 硅肥, 水稻土, 稻瘟病, 抗病性